>> i am. >> he described what he is up against in an interview with cnn. >> joe biden has been doing this a long time. he ran for president twice and he's been on a big stage many times before so that's new for me. i'm doing my homework and studying the issues. the problem he has is he has barack obama's record than he has to run on. >> joe biden offer to this last week in iowa. >> i'm looking forward to it. what i have been doing mostly is studying up on his position on the issues. governor romneyand governor romney. i don't want to say anything in the debates that's not completely accurate. >> the moderator for tonight's debate is causing. martha raddatz. there's a report that president obama attended her wedding. the couple divorced in 1997. abc news is looking into whether it that represents bias. log on to night during the debate to react from your compatible smartphone, a tablet, or your reaction to the debate. we will share the results at 11:00. >> a developing story from colorado. investigators trying to figure out if a body found near denver is that of a young girl who's bee